Electronic tracking device and related system

ABSTRACT

A tracking beacon is provided that is trackable using image sensors. The beacon includes a housing with a lower portion and an upper portion. The upper portion include a light diffusing structure with protrusions to help scatter the emitted light in different directions. A light source is positioned within the housing, and electrical contacts are positioned on an external surface of the lower portion.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to U.S. Provisional Patent ApplicationNo. 62/847,146 filed on May 13, 2019 and titled “Electronic TrackingDevice And Related System”, the entire contents of which are hereinincorporated by reference.

TECHNICAL FIELD

The following generally relates to an electronic tracking device that istrackable by image sensors.

DESCRIPTION OF THE RELATED ART

Tracking objects in a physical space can be difficult, as people andthings move freely and sometimes unexpectedly. Tracking the motion andposition of people things accurately is difficult. Tracking can takeplace using cameras that track markers.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments will now be described by way of example only with referenceto the appended drawings wherein:

FIG. 1 is a schematic diagram of an example of a tracking system thatincludes tracking beacons and tracking sensors.

FIG. 2 is an example embodiment of a tracking beacon.

FIG. 3 is a bottom view of the tracking beacon shown in FIG. 2.

FIG. 4 is a side view of a top portion of a tracking beacon shown inisolation, according to an example embodiment.

FIG. 5a is a bottom view of a top portion of a tracking beacon shown inisolation, according to another example embodiment, and FIG. 5b is across-section view of the top portion taken along the line A-A shown inFIG. 5 a.

FIG. 6 is an example embodiment of components in a tracking beacon.

FIGS. 7a and 7b are a perspective view and a side view of anotherexample embodiment of a tracking beacon.

FIG. 8 is another example embodiment of components in a tracking beacon.

FIG. 9 is an example embodiment of a watch accessory that removablyholds a tracking beacon.

FIGS. 10a and 10b are a side view and a perspective view of a magneticclip that holds a tracking beacon, according to an example embodiment.

FIG. 11 is a perspective view of a snap clip that holds a trackingbeacon, according to an example embodiment.

FIG. 12 is a perspective of a charging station that is configured tocharge one or multiple tracking beacons, according to an exampleembodiment.

FIG. 13 is an example embodiment of components in the charging station.

FIG. 14 is an example embodiment of multiple charging stations stackedupon each other.

FIG. 15 is an example of a tracking system shown in FIG. 1, and furtherincludes a charging station.

DETAILED DESCRIPTION

It will be appreciated that for simplicity and clarity of illustration,where considered appropriate, reference numerals may be repeated amongthe figures to indicate corresponding or analogous elements. Inaddition, numerous specific details are set forth in order to provide athorough understanding of the example embodiments described herein.However, it will be understood by those of ordinary skill in the artthat the example embodiments described herein may be practiced withoutthese specific details. In other instances, well-known methods,procedures and components have not been described in detail so as not toobscure the example embodiments described herein. Also, the descriptionis not to be considered as limiting the scope of the example embodimentsdescribed herein.

FIG. 1 shows a tracking system 100 that tracks the position and movementof tracking beacons 101 a, 101 b, also herein called “beacons”. A beaconis more generally referenced with reference numeral 101. Although twobeacons are shown, it will be appreciated that the tracking system 100can track one beacon or can simultaneously many beacons.

A beacon 101 emits light that is detected by one or more cameras.Preferably, there are two or more cameras to track a beacon in multipledimensions. For example, the cameras 102 a, 102 b, 102 c are positionedoverhead and capture images of the light emitted from a given beacon. Acomputing system 103 receives the images from the cameras then processesthe images using image recognition to identify the position of the lightsources in the image. The position information from the differentcameras are then compared (e.g. using triangulation) by the computingsystem 103 to determine the location of the given beacon inthree-dimensional space.

In an example aspect, the beacons emit infrared light and the cameras102 a, 102 b, 102 c detect the infrared light. In other words, thecameras are infrared cameras. In an alternative embodiment, a light in adifferent range of the light spectrum is emitted and is detected by thecameras 102 a, 102 b, 102 c.

The beacon 101 a and the beacon 101 b emit light at a different blinkingpattern or blinking frequency. The blinking pattern or the blinkingfrequency represents an identifier (ID) that is specific to each beacon.In other words, the beacon 101 a has a first ID and accordingly blinksaccording to a first blinking pattern or blinking frequency that isassociated with the first ID, and the beacon 101 b has a second ID andaccordingly blinks according to a second blinking pattern or blinkingfrequency that is associated with the second ID.

In other words, over a series of images, the computing system 103 isable to detect the blinking pattern of the a given beacon to identifyits associated ID. In this way, the computing system is able to trackthe position and movement of multiple beacons simultaneously.

As shown in FIG. 1, a beacon 101 a can be attached to an object 104(e.g. a person or a thing) so as to track the position of the object. Inan example aspect, the tracking of the beacon or beacons is performed inreal-time.

As shown in FIG. 1, the beacons 101 a, 101 b are low-profiled electronicdevices that can be attached to objects. It is desirable that thesebeacons are small, attachable and convenient to use. In FIG. 1, thebeacons are shown as cylindrical discs. However, other shapes can beused to form the beacon, such as a rectangular prism, a square, anpentagonal prism, a triangular prism, a hexagonal prism, an octagonalprism, or some other polygonal shape. In an example embodiment, thebeacon's housing has an irregular shape, including curves and differentfacets.

In an example embodiment, the beacons are small so that they fit withina person's hand. In another example embodiment, the beacons are smallenough to fit on a person's wrist, like the face of a watch. It will beappreciated that different sizes of the beacon are applicable to theprinciples described herein.

In an example aspect, the beacons 101 a and 101 b are eachself-contained devices that integrate all the components, including thelight emitter, within a beacon housing. In other words, a beacon doesnot have different housings or parts attached to each other withexternal wires. This self-contained device is a very convenient andeasy-to-use form factor. It is also robust.

FIG. 2 shows another example embodiment of a beacon 101. The beaconincludes a housing 200 that has a first portion 202 and a second portion201. The second portion 201 includes a light diffusing structure. One ormore light sources (e.g. light emitting diodes (LEDs)) are positionedwithin the housing and light is emitted through the second portion 201.For example, the one or more light sources are infrared LEDs. The lightdiffusing structure helps for the tracking cameras 102 a, 102 b, 102 cto more easily capture the light emitted from the beacon 101.

In the examples described herein, the first portion 202 is referred toas a lower portion, and the second portion 201 is referred to as anupper portion. However, it will be appreciated that a beacon'sorientation of upper and lower can change. In general, it is desirableto have the light diffusing structure oriented so that one or moretracking cameras can see the light emitted from the beacon.

In an example aspect, the light diffusing structure includes translucentportions and helps to scatter the light in different directions. Inanother example embodiment, the entire upper portion 201 is translucentto scatter the light in different directions.

FIG. 3 shows the bottom surface of the lower portion 202 of the housingand it includes, for example, are electrical contacts 301. Theelectrical contacts do not necessarily need to be on the bottom surfaceof the lower portion. In other example embodiments, the electricalcontacts are located on the lower portion 202 (e.g. side surface orbottom surface, or both).

The electrical contacts 301 are for transferring power and data. Inparticular, some electrical contacts are for power (e.g. also hereincalled power electrical contacts) and some electrical contacts are fordata (e.g. also herein called data electrical contacts). In a furtherexample aspect, the data electrical contacts include at least onecontact for receiving a time synchronization signal. In a furtheraspect, the data electrical contacts electrical contacts receive a timesynchronization signal and a data (e.g. beacon ID data).

In an example embodiment, the data electrical contacts include anelectrical contact for receiving a command to reset a processor of thebeacon (see FIG. 6), an electrical contact to receive a timesynchronization signal to synchronize a time keeper of the beacon (seeFIG. 6), an electrical contact to receive data, and an electricalcontact to transmit data. In an example aspect, the received data andthe transmitted data are received or transmitted using serialcommunications.

In an example embodiment, the power electrical contacts include a commonground electrical contact and an input power electrical contact forcharging the battery of the beacon (see FIG. 6).

Also shown in FIG. 3 is that the electrical contacts 301 are offset froma center vertical axis of the housing.

In an example embodiment, an indent forms a notch 203 along the sidewall of the housing 200 to orient the beacon. The notch continues fromthe lower portion 202 to the upper portion 201. The electrical contacts301 are, for example, positioned closer to the notch 203. The notch isused to orient the beacon within a charging slot, which has contactsthat align with the electrical contacts 301 on the beacon. It will beappreciated that there are alternative ways to use complimentary shapes(e.g. male and female keying) to orient the beacon within a chargingslot, and these alternatives are applicable to the principles describedherein.

Also shown in FIG. 2 is that the lower portion 202 has side walls thattaper inwards from a bottom of the lower portion to the top of the lowerportion. In a further example aspect, the lower portion is rounded and,more particularly, the lower portion has a frustoconical shape.

In another example aspect, the lower portion 202 is opaque and the upperportion 201 is translucent.

Turning to FIG. 4, another example embodiment of an upper portion 201′is shown in isolation from a side view. It includes a first side wall401 that leads to a first top surface 400, then one or more protrusions402 that extend therefrom. The top of the protrusion 402, for example,defines a second top surface 403 that is raised above the first topsurface 400. Although not shown, another protrusion can extend from thesecond top surface 403. The layers of protrusions create a multiplefacets in the upper portion to help scatter the light emitted from thebeacon. The side walls of the protrusion 402 can also include multiplefacets 404 angled in different direction to help scatter the light. Inother words, the upper portion has multi-faceted surfaces that helpscatter the light.

Turning to FIGS. 5a and 5 b, protrusions can extend downwards from thebottom of the housing's upper portion 201″. In particular, FIG. 5a showsan example of an underside surface of an upper portion 201″ shown inisolation, according to another example embodiment. In other words, thisunderside surface is not visible when the upper portion 201″ is attachedto the lower portion 202. FIG. 5b shows a side-view cross-section takenalong the line A-A shown in FIG. 5 a. The top surface of the upperportion 201″ is not shown as the top surface can have differentconfigurations. For example, the top surface of the upper portion canresemble the top surface configuration shown in FIG. 4.

The underside surface 501 has one or multiple protrusions 502, 503, 504that protrude downwards. These protrusions help to scatter the light.The protrusions are shown as concentric rings. However, other shapes ofprotrusions can be used including bumps, divots, craters, and ridges.

In an example aspect, these protrusions on the top surface or theunderside surface, or both, are translucent.

In another example aspect, there are one or more translucent protrusionsthat protrudes downwards from the underside surface of the lightdiffusing structure. In another example aspect, there are multipletranslucent protrusions that include upward facing protrusions thatprotrude upwards from an upper surface of the light diffusing structure.

Turning to FIG. 6, an example embodiment of components in a beacon 101is shown. The components include one or more light emitting devices 602,a time keeper 602, a processor 603, memory 604, and a battery 606. Inanother example, a magnetic component 605 is also part of the beacon101.

The one or more light emitting devices 602, for example, emit infraredlight. The time keeper 602, for example, includes an oscillator. In afurther aspect, the oscillator is a crystal. The time keeper receives atime synchronization signal (e.g. from a charging station or anotherexternal device) and uses this time synchronization signal to calibratethe oscillator. In another example aspect, the processor 603 and thememory 604 are parts of a microcontroller in the beacon. In a furtheraspect, the battery 606 is a rechargeable battery.

The processor and the time keeper control the blinking or strobing ofthe one or more light emitting devices. The memory, for example, storesthe information about the blinking pattern or blinking frequency. In anexample aspect, the one or more electrical contacts provide data thatpresents how fast the one or more light emitting devices strobe. Forexample, the one or more light emitting devices can be preset to strobefrom 1 millisecond to 8 milliseconds. The strobing time length isadjustable. The range of time provided herein is just an example, andthe upper and lower times of the range can be varied in differentexample embodiments.

In an example aspect, the ability to adjust the strobe time allows thesystem to adapt to different operating conditions. For example, thestrobe time of the light emitting device is lowered to save on batterylife, such as when the cameras 102 a, 102 b, etc. can sufficientlydetect the light of the beacon at lower brightness. In another example,if the cameras require a higher level of brightness to detect the lightemitted from a beacon, then the beacon is preset to a longer strobe timeto increase the brightness.

In an example embodiment, the magnetic component 605 is a permanentmagnet. In another example, the magnetic component 605 is a materialthat is magnetically attracted to other magnetic components that arepositioned in accessories, such as a magnetic holder (see FIGS. 10 a, 10b) and a charging slot of a charging station (see FIG. 13). In anexample aspect, the magnetic component does not have to be a permanentmagnet and can be a material such as steel or iron.

In another example, the magnetic component 605 is a permanent magnet andhas its magnetic polarity oriented so that it is magnetically attractedto other permanent magnets that are positioned in accessories, such as amagnetic holder (see FIGS. 10 a, 10 b) and a charging slot of a chargingstation (see FIG. 13).

In an example aspect, the magnetic component 605 is offset from a centervertical axis of the housing 200. A complimentary magnetic component ina charging slot (of a charging station) is also offset so as to helpalign electrical contacts on the beacon 101 with complimentingelectrical contacts on the charging station.

In another example aspect, the magnetic component 605 is positioned ator near the bottom of the lower portion 202 of the housing.

It will be appreciated that the form factor or housing of the beacon 101can differ from what is shown in the drawings. It will also beappreciated that, in some embodiments, the beacon 101 does not include amagnet.

Turning to FIGS. 7a and 7 b, another example embodiment of a beacon 101is shown with a different housing 700. The housing 700 has an uppersurface 701 and a lower surface 703, which are connected by a side wall702 that extends between the upper and lower surfaces 701 and 703. Thebeacon housing 700 is relatively flat. A light emitter 704 is positionedat the upper surface 701. In an example embodiment, the light emitteremits infrared light. In a further example aspect, the light emitter isa light emitting diode (LED). For example, the light emitter 704 is aninfrared LED. In this example, one light emitter 704 is shown. However,in other examples, there may be multiple light emitters positioned atthe surface of the beacon housing 700. The light emitters emit lightthat are tracked by the tracking cameras 102 a, 102 b, 102 c.

In the example shown, a wire connection port 705 is positioned on thehousing 700. The wire connection port 705 receives a wire (not shown)that transmits power and data to the beacon. For example, the wireconnection port 705 has electrical connections that receive power andone or more electrical connections that receive data. In an alternativeembodiment, the housing 700 has different electrical contacts fortransmitting power and data, like the electrical contacts 301 shown inFIG. 3.

It will be appreciated that the beacon housing 700 is shown to have acircular top-down profile in the perspective view shown in FIG. 7 a.However, in other example embodiments, the beacon housing 700 has asquare shape top-down profile, or a pentagon shape top-down profile, ora rectangular shape top-down profile, or a triangle shape top-downprofile, or a hexagon shape top-down profile, or some other shape. Inother words, the shape of the housing can differ from what is shown.

Turning to FIG. 8, another example embodiment of components in a beacon101 is shown, such as the components that are in the housing 700 shownin in FIGS. 7a and 7 b. In an example aspect, there are no magnetswithin the housing. The components include one or more light emittingdevices 801, a time keeper 802, a processor 803, memory 804, and abattery 806. Electrical connections 805, which interface with the wireconnection port 705, receive power and data that connect to thesedifferent components.

The one or more light emitting devices 801, for example, emit infraredlight. The time keeper 802, for example, is a clock that includes anoscillator. In a further aspect, the oscillator is a crystal. The timekeeper receives a time synchronization signal (e.g. via the electricalconnection 805) and uses this time synchronization signal to calibratethe oscillator. In another example aspect, the processor 803 and thememory 804 are parts of a microcontroller in the beacon. Data, such as abeacon ID, is received via the electrical connection 805, and this datais used to define the blinking pattern of the light emitter to representthe beacon ID. In a further aspect, the battery 606 is a rechargeablebattery which receives a power charge via the electrical connection 805.The data provided via the electrical connection 805 can be used, forexample, to preset the strobe length of time. For example, the strobelength of time be decreased to save on battery power. On the other hand,the strobe length of time can be preset at a longer time to increase thebrightness level of the light emitted.

Turning to FIG. 9, a wearable strap 901 is shown in isolation and itincludes a housing 902 to removably hold a beacon 101. The housing 902defines a void 903 therein, and the beacon can be inserted into the voidand removed from the void. One or more straps extend from the housing902. The wearable strap 901 is used to conveniently attach a beacon ontoa person or a thing. For example, the wearable strap 901 can be worn onthe wrist of a person. In another example, a person wears a firstwearable strap assembled with a first beacon on one wrist, and a secondwearable strap assembled with a second beacon on another wrist. In thisway, the movement of the person's arms can be individually tracked.Either in addition or in alternative, the person wears a third wearablestrap assembled with a third beacon on one ankle, and a fourth wearablestrap assembled with a fourth beacon on the other ankle, so that theperson's leg movements can be individually tracked.

In this example shown, the housing 902 is circular to receive acircular-shaped beacon 101. However, in another example embodiment, suchas a square-shaped beacon, the housing 902 is also square-shaped to holdthe square-shaped beacon. More generally, the void defined by thehousing of the wearable strap is shaped to receive the shape of thehousing of the beacon 101.

FIG. 10a and FIG. 10b show a magnetic holder 1000 that hold a beaconusing magnetic force. This magnetic holder is applicable to beacons thathave a magnet. The magnetic holder includes a body 1001 and a magneticcomponent 1003 held within in the body 1001. The magnetic component 1003in the magnetic holder 1000 and the magnetic component 605 in a beaconare magnetically attracted to each other and hold the beacon to themagnetic holder together.

At or near the bottom of the magnetic holder's body are sew-throughholes 1002 that are used to attach the magnetic holder to material (e.g.fabric, textile, sheets, clothing, etc.).

The body 1001 of the magnetic holder includes a perimeter wall 1004 thatprotrudes higher than the magnetic component 1003, and the perimeterwall is shaped to encompass at least part of the lower portion 202 ofthe housing of the beacon. In an example aspect, the perimeter wall 1004is angled outwards. The perimeter wall helps to hold the beacon inplace, from sliding away from the magnetic component 1003.

In an example use, the magnetic holder can be placed on one side of afabric and the beacon is placed on the opposite side of the fabric.Under magnetic force, the beacon and the magnetic holder pull towardseach other and clamp the fabric there between. In other words, themagnetic holder can be used to attach a beacon to a person's clothingwithout sewing or without puncturing the person's clothing.

In another example use, the magnetic holder is sewed on to a fabric, anda beacon is removably placed onto the magnetic holder. In other words,the magnetic holder 1000 can be sewn to a person's clothing or someother material. In this way, a beacon that has a magnet can be easilyattached to and removed from a person's clothing or some other material,where the person's clothing or the material has attached on it themagnetic holder 1000.

In this example shown, the magnetic holder 1000 is circular to receive acircular-shaped beacon 101. However, in another example embodiment, suchas a square-shaped beacon, the magnetic holder 902 is also square-shapedto hold the square-shaped beacon. More generally, the magnetic holder isshaped to receive and hold the shape of the housing of the beacon 101.

Turning to FIG. 11, an example of a snap clip 1100 is shown isisolation.

The snap clip 1100 includes a planar body 1101 and multiple resilientprotrusions 1102 that extend upwards from the planar body. The beacon101 removably is held in the snap clip 1100 by placing the beaconbetween the multiple resilient protrusions 1102, and the multipleresilient protrusions resiliently flex outwards around the housing ofthe beacon.

In an example aspect, multiple sew-through holes 1103 are defined in theplanar body to attach the snap clip to material (e.g. fabric, textiles,clothing, etc.).

In an example embodiment, two or more sew-through holes 1103counter-sunk below the surface of the planar body 1101. Moreparticularly, a surface 1104 between the two or more sew-through holesis lower than the surface of the planar body 1101. In this way, threadpassing through the holes 1103 does not protrude above the surface ofthe planar body 1101.

In this example shown, the snap clip 1100 and the protrusions 1102 arearranged in a circular manner to receive a circular-shaped beacon 101.However, in another example embodiment, such as a square-shaped beacon,the snap clip has protrusions 1102 that are arranged to receive thesquare-shaped beacon. More generally, the void defined by theprotrusions are arranged in configuration to receive the shape of thehousing of the beacon 101.

Turning to FIG. 12, an example embodiment of a charging station 1201 isshown. The body 1202 of the charging station has defined therein one ormore charging slots 1203. In an example embodiment, the charging slots1203 are shaped to compliment the shape of the beacon. For example, ifthe beacon is circular, then the charging slot is circular and is sizedto receive the beacon.

In an example embodiment, there is one charging slot in a chargingstation. In another example embodiment, there are two or more chargingslots in a charging station. In an example embodiment, there are threeor more charging slots in a charging station. In an example embodiment,there are six or more charging slots in a charging station. In anotherexample embodiment, there ten or more charging slots in a chargingstation.

As shown in an example top-down view 1206 of a given slot 1203 inisolation, each of the charging slots include electrical contacts 1204that are complimentary in position to the electrical contacts 301 of agiven beacon 101. In this way, when a beacon is inserted into thecharging slots, the electrical contacts 301 contact the electricalcontacts 1204 of the charging slot.

The electrical contacts 1204 include power electrical contacts forproviding power to a given beacon and data electrical contacts forproviding data to the given beacon.

In another example aspect, each of the charging slots include a magneticcomponent to magnetically attract the given beacon.

In another example aspect, the data electrical contacts and the powerelectrical contacts are offset to one side of the charging slot, and themagnetic component is offset to the same one side of the slot. Thisconfiguration uses magnetic force to align the electrical contacts onthe beacon to the electrical contacts on the charging slot.

In an example aspect, each charging slot includes a protrusion 1205 ornotch that compliments the feature of the notch 203 in a beacon, inorder to facilitate alignment.

The charging station 1201 also includes data and power ports 1207.

In the example shown in FIG. 12, the charging slots are circular toreceive a circular shaped beacon. However, in other example embodimentsin which the beacon has a different shape, the charging slots are alsoshaped to match the shape of the beacon. For example, if the beaconhousing is square shaped, then the charging slot is square shaped toreceive the square-shaped beacon housing.

Turning to FIG. 13, example components of a charging station areprovided. A processor system 1301 manages the operation of the chargingstation. There are multiple charging slot modules 1304 and each onecorresponds to a different charging slot 1203. Each charging slot module1304 includes a magnetic component 1305, power electrical contacts 1306and data electrical contacts 1307. A power bus 1302 connects to all thepower electrical contacts 1306 of all the charging slot modules. A databus connects to all the data contacts 1307 of all the charging slotmodules.

While a beacon is inserted into a charging slot, the charging stationcharges the battery of the beacon and synchronizes the time keeper ofthe beacon. The charging station can also modify the tracking ID of thebeacon, or the blinking pattern of the beacon, or the blinking frequencyof the beacon, or a combination thereof.

The charging station, for example, provides the same timesynchronization signal to all the beacons in the charging slots.

In another example aspect, the charging station is able to providedifferent data (e.g. different commands, different tracking IDs, etc.)to different charging slots. In this way, different beacons in a givencharging station can be assigned different IDs and different blinkingpatterns.

In an example aspect, at least one of the data electrical contacts 1307provides a time synchronization signal to a given beacon that isinserted into a given charging slot.

In another example aspect, the data electrical contacts 1307 provide atime synchronization signal and tracking identity data to the trackingbeacon.

In an example embodiment, the data electrical contacts 1307 include anelectrical contact for transmitting a command to reset a processor ofthe beacon, an electrical contact to transmit a time synchronizationsignal to synchronize a time keeper of the beacon, an electrical contactto transmit data to the beacon, and an electrical contact to receivedata from the beacon. In an example aspect, the received data and thetransmitted data are received or transmitted using serialcommunications.

In an example embodiment, the power electrical contacts 1306 include acommon ground electrical contact and a power electrical contact forcharging the battery of the beacon.

In operation, after a beacon is inserted into a charging slot, thecharging slot automatically starts transmitting a time synchronizationsignal to the beacon. In an example aspect, no additional steps arerequired to synchronize the time keeper of the beacon. In other words, auser jams or inserts the beacon into the charging slot and the beacon isthen synchronized, which is very easy to operate and convenient.

In an example embodiment, the charging station 1201 has an internetprotocol (IP) address.

In an example aspect, another computer device can access the chargingstation 1201 to determine which beacons are connected to the chargingstation, and determine which particular beacon (having a beacon trackingID) is located in a particular charging slot on the charging station.For example, this information can be viewed via a software on thecomputer device.

In another example, the charging station can also pass a timesynchronization signal to other connected charging stations. Forexample, the charging stations can be networked together in adaisy-chain configuration.

In another example aspect, the charging station has a lid to cover thetop surface over the charging slots.

Turning to FIG. 14, an example embodiment of a charging station 1201′include protrusions and reliefs on the top or the bottom surfaces (orboth) of each charging station, so that the charging stations can bestacked on top of each other.

For example, a raised lip 1401 is positioned on the outer top edge ofthe charging station. The bottom edges 1402 of the charging station arenested within the raised lip 1401. This helps to keep the chargingstations from sliding off each other when they are stacked.

In an example embodiment, the side walls of a charging station taperdownwards to a smaller footprint, so that the bottom edges 1402 of thecharging station fit within the raised lip 1401 of another chargingstation.

In a further example aspect, the top surface of the beacon that sits ina lower charging station is spaced from the bottom surface of anothercharging station that sits on top of the lower charging staging.

More generally, a system is provided that includes at least a firstcharging station and a second charging station. Each charging stationincludes multiple charging slots for respectively holding multipletracking beacons. Each charging station can also include a data bus anda power bus connected to each of the multiple charging stations. Thebody of each charging station includes a stacking feature on a topportion of the body and a complimentary stacking feature on a bottomportion of the body.

In particular, the stacking feature on the top portion of the body onone charging station mechanically interacts with the complimentarystacking feature on the bottom portion of the body of another chargingstation, so that the two charging stations do not slide off each other.Various types of shapes, protrusions, indents, grooves, etc. can be usedto form the stacking feature and complimentary stacking feature.

The first charging station and the second charging station are stackableon top of each other while respectively holding the multiple beacons.

Turning to FIG. 15, an example tracking system 100 shows that thebeacons 101 b and 101 a can be swapped in and out of the charging slotsin a charging station. The computer system 103 provides timesynchronization data to the charging station, which helps to synchronizethe time keeper of the beacons, a time keeper of the computer system 103and a time keeper of each of the cameras 102 a, 102 b, 102 c. In thisway, the active components of the tracking system are synchronized usingthe same time stamping.

Below are general example embodiments of the systems and devicesdescribed herein.

In a general example embodiment, a tracking beacon includes a housingthat holds a light emitter that emits infrared light external to thehousing. The housing further holds within itself components, and thecomponents comprise: a processor, a memory device, a time keeper, and abattery. One or more electrical connections are positioned on thehousing to receive at least electrical power to charge the battery, datadefining a blink pattern of the light emitter that is stored on thememory device and controlled by the processor, and a synchronizationsignal to adjust the time keeper

In an example aspect, the data defining the blink pattern furtherincludes a strobe length of time of the light emitter. In an exampleaspect, the strobe length of time is preset to a value in a range from 1millisecond to 8 milliseconds.

In another example aspect, the components within the housing furtherincludes a magnet.

In another example aspect, there are multiple electrical connectionspositioned on the housing. In an alternative example aspect, there isone electrical connection that is a wire connection port configured tointerface with a connector of a wire bundle.

In another example aspect, a translucent light diffusing structure formspart of the housing and diffuses the infrared light emitted by the lightemitter.

In another general example embodiment, a tracking beacon includes: ahousing comprising a first portion and a second portion, the secondportion comprising a light diffusing structure; and a light source, amagnet, a processor and a time keeper stored in the housing, wherein theprocessor and the time keeper control the light source. In an exampleaspect, the second portion is translucent.

In another general example embodiment, a tracking beacon includes: ahousing comprising a lower portion and an upper portion, the upperportion comprising a light diffusing structure; the light diffusingstructure comprising a translucent protrusion to diffuse light indifferent directions; a light source positioned within the housing; andelectrical contacts positioned on an external surface of the lowerportion.

In an example aspect, the light diffusing structure is translucent.

In another example aspect, the translucent protrusion protrudesdownwards from an underside surface of the light diffusing structure.

In another example aspect, there are multiple translucent protrusionscomprising upward facing protrusions that protrude upwards from an uppersurface of the light diffusing structure.

In another example aspect, a magnet is positioned within the housing.

In another example aspect, the magnet is positioned at a bottom of thelower portion.

In another example aspect, the magnet is offset from a center verticalaxis of the housing.

In another example aspect, the lower portion has one or more side wallsthat extend from a bottom of the lower portion to a top of the lowerportion, and taper inwards towards the top of the lower portion.

In another example aspect, the lower portion is opaque.

In another example aspect, the electrical contacts comprise powerelectrical contacts and data electrical contacts.

In another example aspect, at least one of the data electrical contactscomprise electrical contacts receive a time synchronization signal.

In another example aspect, the data electrical contacts receive a timesynchronization signal and receive tracking identity data.

In another example aspect, the electrical contacts are offset from acenter vertical axis of the housing.

In another example aspect, the housing comprises a notch.

In another general example embodiment, a kit of parts is provided thatincludes a wearable strap and a tracking beacon. The wearable strapincludes: a housing defining a void therein; and one or more strapsattached to the housing, or extending from the housing. The kit of partsalso includes a tracking beacon that is removably insertable in the voidof the housing, the tracking beacon including: an upper body portion anda lower body portion, and the upper body portion comprising a lightdiffusing structure. The kit of parts also includes one or more infraredlight sources positioned within the tracking beacon.

In an example aspect of the kit of parts, electrical contacts arepositioned on an exterior surface the lower body portion.

In another example aspect of the kit of parts, a magnet is positionedwithin the lower body portion.

In another example aspect of the kit of parts, the light diffusingstructure comprises translucent protrusions that diffuse the light indifferent directions.

In another general example embodiment, a kit of parts is provided thatincludes a magnetic holder that comprises: a body and a first magneticcomponent held within in the body. The kit of parts also includes atracking beacon that comprises: a housing comprising a lower portion andan upper portion, the upper portion comprising a light diffusingstructure; and a light source and a second magnetic component are storedin the housing. The first magnetic component and the second magneticcomponent are magnetically attracted to each other hold the trackingbeacon and the magnetic holder together.

In an example aspect of the kit of parts, the body of the magneticholder comprises sew-through holes to attach the magnetic holder to amaterial.

In another example aspect of the kit of parts, the body of the magneticholder comprises a perimeter wall that protrudes higher than the firstmagnetic component, and the perimeter wall is shaped to encompass atleast part of the lower portion of the housing of the tracking beacon.In another example aspect of the kit of parts, the perimeter wall isangled outwards.

In another general example embodiment, a kit of parts is provided thatincludes a snap clip and a tracking beacon. The snap clip comprises: aplanar body and multiple resilient protrusions that extend upwards fromthe planar body. The tracking beacon comprises: a housing comprising alower portion and an upper portion, the upper portion comprising a lightdiffusing structure; and a light source is stored in the housing. Thetracking beacon removably is held in the snap clip by placing thetracking beacon between the multiple resilient protrusions, and themultiple resilient protrusions resiliently flex outwards around thehousing of the tracking beacon.

In an example aspect of the kit of parts, multiple sew-through holes aredefined in the planar body to attach the snap clip to material.

In another general example embodiment, a charging station for trackingbeacons is provided. The charging station comprises multiple slotsshaped to each receive a given tracking beacon. Each of the slotscomprise: power electrical contacts for providing power to a giventracking beacon, data electrical contacts for providing data to thegiven tracking beacon, and a magnetic component to magnetically attractthe given tracking beacon.

In an example aspect of the charging station, each of the slots arecircular shaped.

In another example aspect of the charging station, the data electricalcontacts and the power electrical contacts are offset to one side of theslot, and the magnetic component is offset to the same one side of theslot.

In another example aspect of the charging station, at least one of thedata electrical contacts provides time synchronization data to the giventracking beacon.

In another example aspect of the charging station, the data electricalcontacts provide a time synchronization signal and tracking identitydata to the given tracking beacon.

In another example aspect of the charging station, the data electricalcontacts comprise an electrical contact for resetting a processor of thegiven tracking beacon, an electrical contact to provide a timesynchronization signal, an electrical contact to transmit data, and anelectrical contact to receive data.

In an example aspect of the charging station, after detecting that aninserted beacon is positioned in a given slot, the charging stationautomatically transmits a time synchronization signal to the insertedbeacon.

In another general example embodiment, a system is provided thatcomprises at least a first charging station and a second chargingstation. Each charging station comprises: multiple charging slots forrespectively holding multiple tracking beacons; a data bus and a powerbus connected to each of the multiple charging stations; and a bodycomprising a stacking feature on a top portion of the body and acomplimentary stacking feature on a bottom portion of the body. Thefirst charging station and the second charging station are stackable ontop of each other while respectively holding the multiple beacons.

It will be appreciated that any module or component exemplified hereinthat executes instructions may include or otherwise have access tocomputer readable media such as storage media, computer storage media,or data storage devices (removable and/or non-removable) such as, forexample, magnetic disks, optical disks, or tape. Computer storage mediamay include volatile and non-volatile, removable and non-removable mediaimplemented in any method or technology for storage of information, suchas computer readable instructions, data structures, program modules, orother data. Examples of computer storage media include RAM, EEPROM,flash memory or other memory technology, digital versatile disks (DVD)or other optical storage, magnetic cassettes, magnetic tape, magneticdisk storage or other magnetic storage devices, or any other mediumwhich can be used to store the desired information and which can beaccessed by an application, module, or both. Any such computer storagemedia may be part of the servers or computing devices or nodes, oraccessible or connectable thereto. Any application or module hereindescribed may be implemented using computer readable/executableinstructions that may be stored or otherwise held by such computerreadable media.

It will be appreciated that different features of the exampleembodiments of the system, the devices, and the components as describedherein, may be combined with each other in different ways. In otherwords, different devices, modules, operations, functionality andcomponents may be used together according to other example embodiments,although not specifically stated.

It will also be appreciated that the examples and corresponding systemdiagrams used herein are for illustrative purposes only. Differentconfigurations and terminology can be used without departing from theprinciples expressed herein. For instance, components and modules can beadded, deleted, modified, or arranged with differing connections withoutdeparting from these principles.

Although the above has been described with reference to certain specificembodiments, various modifications thereof will be apparent to thoseskilled in the art without departing from the scope of the claimsappended hereto.

1. A tracking beacon comprising: a housing that holds a light emitterthat emits infrared light external to the housing; the housing furtherholding within itself components, the components comprising: aprocessor, a memory device, a time keeper, and a battery; and one ormore electrical connections are positioned on the housing to receive atleast electrical power to charge the battery, data defining a blinkpattern of the light emitter that is stored on the memory device andcontrolled by the processor, and a synchronization signal to adjust thetime keeper.
 2. The tracking beacon of claim 1 wherein the componentswithin the housing further comprise a magnet.
 3. The tracking beacon ofclaim 1 wherein there are multiple electrical connections positioned onthe housing.
 4. The tracking beacon of claim 1 wherein there is oneelectrical connection that is a wire connection port configured tointerface with a connector of a wire bundle.
 5. The tracking beacon ofclaim 1 wherein a translucent light diffusing structure forms part ofthe housing and diffuses the infrared light emitted by the lightemitter.
 6. A tracking beacon comprising: a housing comprising a firstportion and a second portion, the second portion comprising a lightdiffusing structure; and a light source, a magnet, a processor and atime keeper stored in the housing, wherein the processor and the timekeeper control the light source.
 7. The tracking beacon of claim 6wherein the second portion is translucent.
 8. A tracking beaconcomprising: a housing comprising a lower portion and an upper portion,the upper portion comprising a light diffusing structure; the lightdiffusing structure comprising a translucent protrusion to diffuse lightin different directions; a light source positioned within the housing;and electrical contacts positioned on an external surface of the lowerportion.
 9. The tracking beacon of claim 8 wherein the light diffusingstructure is translucent.
 10. The tracking beacon of claim 8 wherein thetranslucent protrusion protrudes downwards from an underside surface ofthe light diffusing structure.
 11. The tracking beacon of claim 8wherein there are multiple translucent protrusions comprising upwardfacing protrusions that protrude upwards from an upper surface of thelight diffusing structure.
 12. The tracking beacon of claim 8 wherein amagnet is positioned within the housing.
 13. The tracking beacon ofclaim 12 wherein the magnet is positioned at a bottom of the lowerportion.
 14. The tracking beacon of claim 12 wherein the magnet isoffset from a center vertical axis of the housing.
 15. The trackingbeacon of claim 8 wherein the lower portion has one or more side wallsthat extend from a bottom of the lower portion to a top of the lowerportion, and taper inwards towards the top of the lower portion.
 16. Thetracking beacon of claim 8 wherein the electrical contacts comprisepower electrical contacts and data electrical contacts.
 17. The trackingbeacon of claim 16 wherein at least one of the data electrical contactscomprise electrical contacts receive a time synchronization signal. 18.The tracking beacon of claim 16 wherein the data electrical contactsreceive a time synchronization signal and receive tracking identitydata.
 19. The tracking beacon of claim 8 wherein the electrical contactsare offset from a center vertical axis of the housing.
 20. The trackingbeacon of claim 8 wherein the housing comprises a notch.